Vibration motor



Jan. 6, 1925. 1,522,260

w. J. O'LEARY VIBRATION MOTOR Original Filed May 29, 1920 W bow JflZeary 3% g M 141,001 My Patented Jan. 6, 1925.

UNITED STATES WILLIAM J'- OLEARY, OF MONTREAL, CANADA.

VIBRATION MOTOR.

Original application filed May 29, 1920, Serial No. 385.218. Divided andthis application filed June 30,

To all whom it may concern:

Be it known that I, WILLIAM J. OLEARY, a subject of the King of England,residing in Montreal, Canada, have invented certain new and usefulImprovements in Vibration Motors, of which the following is aspecification.

The present invention relates generally to motors and more specially toan electric motor, and comprises a division of my prior applicationSerial Number 385,218, filed May 29, 1920.

The motor comprising the present invention is of the vibration type andis illustrated as being designed as a traction motor. The principle,however, may be utilized for any motive power, traction or otherwise. Invibration motors, particularly Where utilized with alternating current,it is necessary that the vibrating element be synchronized with thecycles of the alternating current in order that the motor will operateproperly. This synchronism may be obtained in many ways; one of which isto weight the vibrating member by means of an adjustable weight. Thisweight, however, is liable to become loosened and cause trouble. In viewof the fact that vibrating motors of this type operate through aflexible band in which waves are propagated by the vibration member itis desirable that this member be operated with quickness andconsiderable strength.

The present motor is an improvement on the known prior art and morespecially improves the prior art by means which control the vibratingmember in such manner as to render this member easily tuned for circuitswith which it is adapted to operate. One form of the constructioncomprises a pair of opposed springs on one end of the vibrating memberand preferably the outer end thereof, which springs are adapted to beadjusted as to tension. The electric current operates the vibratingmember in one direction and the springs operate the member in the otherdirection so that the tension on the springs controls the quickness ofresponse of the vibrating member to normal position. Fur thermore,adjustment of the springs controls the swing of the vibrating member andthereby the amplitude of the waves set up in the flexible band so that aspeed control is also obtained.

Having generally described the motor, 1t

Serial No. 571,956.

may be stated that the principal object thereof is adjustment meanscontrolling the movement of a pivoted armature in such manner as tocontrol the amplitude of vibration when the armature is operating undera given force.

A still further object of the present invention is a synchronizingadjustment for a vibration motor comprising a means for increasing ordecreasing the normal period of oscillation of the vibrating member towhich the flexible band is attached.

A still further object of the present invention is mechanism forcontrolling the amplitude of vibration of a swinging armature which isconnected to a flexible drive band whereby the character of the wavesset up in the band may be controlled as desired.

A. still further object of the present inven tion is mechanism forcontrolling the amplitude of vibration of a swinging armature by meansof opposed springs bearing upon the free end thereof. Other and furtherobjects of the present invention will in part be obvious and will inpart be pointed out hereinafter in the specification following byreference to the accompanying drawin s forming a part of thespecification.

It is realized the present invention may be embodied in structures otherthan those herein specifically illustrated and described so thereforethe disclosure herewith is to be understood to he illustrative and isnot to be considered in the limiting sense.

Figure l of the drawings is a side elevational view of one form of theinvention.

Figure 2 is an end view of the motor shown in Figure 1;

Figure 3 is a sectional view of the motor shown in Figure 1.

Referring now to the drawings and more specially to Figures 1 and 2, itwill be noted that the frame 1 and 2 carries an electromagnetic core 4which is arranged to comprise two pole pieces 5 and 6 which extendtoward and lie adjacent the vibrating member T. This vibrating member 7preferably is a laminated construction and is mounted upon a suitablepivot 8 which is carried by the frame. The end'of the member 7 oppositethe pivot extends upwardly and comprises a pair of fingers 9 betweenwhich an adjustment bolt 10 carries a pair of opposed coil springs 11and 12. The said bolt 10 is provided with a suitable adjustment nut 14which maintains the adjustment bolt in position on the frame of themotor and also comprises a means of adjustment for the coiled springs.By tightening the nut 14 the coiled springs 11 and 12 are compressed oneach side of-the fingers 9 and thereby tend to limit the degree ofmovement of the vibrating member 7. By shortening the degree ofmovementthe rate of oscillation of this device is increased and since theimpulses which operate this member are determined by the make and breakdevice 15 when the motor is constructed for use on direct current, ittherefore follows that the tightening of the adjustment nut increasesthe number of oscillations of the vibrating member for a given time.This also controls the waves set up in the transmission band 16 andthereby directly controls the speed at which the rotating member 17turns. It is to be understood that the rotating member 17 is partlyencompassed by the vibrating band 16 and that the waves in the-bandcause the rotating member to turn. This adjustment therefore provides aspeed regulation whereby the speed of the motor may be increased ordecreased at the will of the operator while the motor is in operation ornot as is desired.

The transmission band 16 is connected to the vibrating member by meansof a bracket 18 which has a portion 19 which extends outwardly from thevibrating member so that when this member oscillates on its pivot 8 theortion 19 of the bracket extending along t e traction band tends to swintransversely of a tangent line from the rum 1? to the bracket, when thebracket is in its normal position of rest. This transverse movementfacilitates the establishment of the transverse waves in thetransmission band. The band 16 is normally in contact with the drum 17to the tension ofthe anchoring spring 20 which is adjustably mounted onthe motor frame. The purpose of the anchorin spring is to maintain theband under tension and in contact with the drum 17, since the rotativemovement as above stated is produced more specially by waves set up insaid band.

' Where this motor is used with alternating current the make and breakdevice may be short circuited or entirely omitted. The armature memberthen tends to vibrate in accordance with the frequency of thealternating current used. In prior t pes of vibrating motors utilizingtuning ork armatures or flat spring buzzer type motors the armatures hada predetermined period of vibration so that if the alternating currentdropped or increased a few cycles per second the cycles would become outof tune with the normal period of the armature and thereby tend to stopthe motor. This may have been due to the fact that the bending of theflexible member of the armature occurred in a very restricted area sothat the limits of the natural eriod of vibration under the prior t pe omotors was quite limited and any su stantial cycle change would go sofar outside of its limits that the magnetic forces and the forces ofelasticity became antagonistic. In the new type of motor hereindisclosed, the armature is pivoted and the springs being on thevibrating end of the armature are of such a construction that theypermit the armature to be adjusted so as to accommodate these vibrationsto the frequency of the current being utilized and the motor thereforedoes not tend to stop or lose efiiciency when the current cycle ischanged. However, the adjustment nut 14 provides a means whereby thenormal period of vibration of the armature may be redctermined andadjusted to correspon to various cycles. With this construction it istherefore possible to build one type of motor and by changing thesprings, to accommodate this motor to several different cycles offrequency of current.

Another feature due to this construction is that which occurs when theadjusting nut is tightened, thereby tending to decrease the air gap andconsequently increase the pull and power of the motor. Where directcurrent is used and themake and break device is included, the tensioningof the springs increases the eriodicity of the armature and thereforeten s to benefit both the speed and power factor of the motors. Theadjustment construction may also be adjusted in such manner that thearmature is very slightly out of tune with the alternating current.\Vhen this happens the motor tends to maintain constant speed undergreatl varied current conditions and also an increased torque isobtained.

The arrangement of the armature with the pivot at one end and balancesprings at the other end is useful in the electric art other than thisparticular motor, for example in such constructions as vibrators orvibratory indicators where constant vibration is desired and in manyother places where the advantages to be obtained by the presentconstruction may be useful.

Having thus described my invention, what I claim is:

1. An electric motor of the vibration type comprising a frame, anenergizing coil carried by said frame, a vibration member, a drum, atransmission band connected to said vibration member and in engagementwith said drum, and continuously o posed s ring means for controllingthe osci ation 0 said vibrating member by stiffening the action of saidmember.

2. In an electric motor of the vibration type comprising a frame, anenergizing coil,

a vibration member, a transmission band connected to said member, a drumin contact with said band, and opposed coiled springs on each. side ofsaid vibration member.

In an electric motor of the vibration type comprising a frame, anenergizing coil, a vibration member, a transmission band connected tosaid member, a drum in contact with said band, opposed coiled springs oneach side of said vibration member and in contact therewith, and meansto compress said springs.

4. A motor of the vibration type comprising a frame, an energizing coilcarried by said frame, a vibration member, a drum, and a transmissionband having an end connected to said vibration member and in contactwith said drmn, said end of the transmission band being supported alonga line tangentially to said drum.

5. A vibration motor comprising in combination a frame, an energizingcoil,avibration member, a drum, a transmission band in engagement withsaid drum, a stiff bracket carried by the member and extending in thedirection of the length of the band and connecting said band to saidmember to cause transverse waves 'in said band when said vibrationmember oscillates.

6. A vibration motor comprising in combination a frame, an energizingcoil, a vibration member, a drum, a transmission band in engagement withsaid drum, and rigid means extending outwardly from said member andconnecting said band to said memher to cause transverse waves in saidband when said vibration member oscillates.

7. An article of manufacture comprising an electromagnet, an armaturepivoted adjacent said electromagnet, and a pair of coiled springsdisposed on opposite sides of thefree end of said armature whereby saidsprings are alternately compressed and relaxed when said electromagnetis energized by a pulsating current.

8. An electromagnet device comprising in combination an electromagnet,an armature pivoted adjacent said electromagnet, a pair of opposedsprings, one on each side of said armz'iture, and means forsimultaneously increasing the tension of said springs.

9. In an electric motor of the vibration type the combination of aframe, an energizing coil carried by said frame, a vibration memberpivoted at one end in said frame,

a drum, a transmission band connected to said vibration member and inengagement with said drum, and opposed yielding means operative on thefree end of said vibration member for limiting the oscillation of saidmember.

10. In an electric motor of the vibration type the combination of aframe, an energizing coil, a vibration member pivoted at one end in saidframe and adapted to be operated by said coil, a transmission bandconnected to said member, a drum with which said band contacts, and apair of opposedly coiled springs with one s ring on each side of thefree end of said vibration member.

11. In a motor of the vibration type the combination of a frame, anenergizing coil carried by said frame, a vibration member adapted to beoperated by said coil, a drum, a transmission band connected to saidvibration member and in contact with said drum, means to positively whipsaid band transversely to setup transverse waves therein, and opposedspring means to adjustably control the period of vibration of saidvibration member.

12. An electrical device comprising an electromagnet, an armaturemounted for vibration adjacent said electromagnet, a make and breakdevice associated with said armature, and continuously operative opposedspring means independent of said make and break to modify the vibrationof said armature.

WILLIAM J. OLEARY.

